Telephony



2 Sheets-Sheet 1.

" (NOMOaI.)

R. HOPE-JONES.

TELEPHONY (No Model.) 2 Sheets-Sheet 2.

R. HOPE-JONES. TELEPHONY.

No. 477,866. Patented June 28, 18,92.

Ninn "trains:

ROBERT Horn-JONES, 0F B IRKENHEAD, ENGLAND..

TELEPHQNY.

' vsrncnricarroir forming mi of Letters patent No. mises, dated Ju'ne as,- '1 se2 Application iiled September 17, `189].. Serial No. 405,950. (Nogmodel.)

To all. whom it may' concern:

y Be itkpnown that I, ROBERT HOPE-JONES, electrical engineer, a' subjectof the Queen of Great Britain'residing at Birkenhead, in the .county of ,'Chest'er', 1a,nd,`.have'v invented .certain new-and useful Improvements 'in Apparatus for Magnifying Sounds, tion.

for'its 'objevze'tfthe magnifying-'of minute vi-l [based consists.. in 'transforming (when necessary) the vibrations orimpulses to be magnilied into acorr'esponding series of electrical in accordance 'vibrations or impulses, passing such impulsesi vthrough Aan electro-magnetic device-capable o f creating-or varying a magnetic 4iield (ortields) with said impulses, permitting such magnetic field to oier correspondingly 'through itinaconstant directionjand driven varying amounts of retardinglforce tof' the' movement of anelectric cqnductorpassing by an extraneous power, and transmitting to. 'a suitable. vibrator-'y' diaphragm successive Y In carrying the invention in-topractical-ef-i fectA the'vibrations or impulses to be magniftiedare transformedv when necessary into a;

portions4 of said extraneous motive power, varying in' accordance with the power -ah-A -sorbcd 'in overcoming thesaidvarying amonntsof retarding force.

corresponding series of electrical vibrations. 'or impnlsesby means of 'a suitable electromagneticor variable 'contact device, such as.

a telephonie transmitter. These electrical impulses are then caused to circulate through' the coils' of one or more electro-magnets, preti-l erably of thehorseshoe type, which may he permanently magnetized or otherwise, .where` bya magnetic iield (orfelds) is (or are) created or variedpin intensity. The strength f this magnetic ield varies in accordance withV the impulses passingthrough the coi-ls.` `An Y electric conductor driven Vby any suitable en?.J

traneous force in 'a constant direction and moving in either a curved or rectilinear path is so mounted with respect to the magnet or.

of which .thefollowing isa s p'eeicaf,

This invention relates'to apparatushaving aphragm a series of vibrations tothe electrical vibrations or and-more `or `less of. the' same quality as the magnets that the whole or 'a "portion of it passes thronghthe magnetic field. -The mag- :netic'iield opposes to. the movement of the, conductora certain amountotl retarding-force; E 'varying' with 4the variations in lthe field.

f Either the magnetor the 'conductor is 'mounted 'upon or otherwise made movable-with a sec;l l ondary diaphragm or similar vibrator'y body.. The various parte are preferably so 'arranged exerts a constant',

-less perpendicular therete. liiio'me'ntary' variathat the moving conductor'or some part mov- .able therewith 'normally though generally very' slight,`

puslilor pull i- Aupon the d.iaphragm 'in a. directionjmom tions in theamonntof the aforesaidmagnetic retardation cause -corresp'ondingfmomentary 1 variations in .the force of said with theresult that there isset impulses ,passinground the coils of the magnet.l Byproperly proportioning a`nd arranging ,the appie v' ratus .there may beset up inthe diaphragm vibrations exactly correspondingto but eta up in the dia-- corresponding.

vmuch greater amplitudethan" theoriginal sound or other mechanical vibrations. .Sounds maythus be4 produced. havingthe same pitch original sounds, but having a much greater i'ntensityor magnitude. To' magnify elec-ll trical 'impulses .or vibrations thediaphragm' a Suitable -v '8 5'. d'uces in 'a magnified degree the original 'impulses, jor it lmay be4 those passing r'on'ndjtheor its equivalent is connected with electric. transmitting device, which 'reprol magnet-coils. Other .vibratory bodies may',

as hereinafter-described, be substituted for a 'The' drawings il ustrate 'a few forms' of ap- -paratus embodying the invention.

the secondary dia hragm., l.

, In thedrawings',-Figures 1 and 2 a're sido ele" vation and plan, respectively, of 'a type of appa- 'raratus in .which the electric conductor is in.

vation ofthe apparatus-shown in "Fig-s. ligand 2, parts of Ythe driving mechanism 'being` r`e7 moved. Figs. 4 and 5 are views -siniikar to ido `conductoris in the form of an Aendless trav! 95.. the for'm of arevplvingdisk, the magnet not cling band. Fig. 7 is a section on line V V, Fig.- 6. Figs; Sand 9-are respectively Lelevation .and sectional plan of. a reversed ar' Fig. 1 3 i's a-side'elevation, and Fig. 14 a rear ro elevation withparts removed,of a form of" ja' continuousjet of liquid. Fig. 15'is a sidey elevation showinga reversed arrangement of 'rangement of the apparatus show'n in Figs. 6 and 7. `.Fig. 10 isa section on line'U U, Fig.

8.` Fig. 11 shows in side elevation a modi-v tied arrangement of the' apparatus seenl in Fig'.-v 8.. Fig. 12 isa sc ction on line T T, Fig. 11.

apparatus in which the electric conduet'o'ris the apparatus seen in Fig. 13.

vReferring first more especially to Figs. 1, 2,

and 3, Q is an electro-magnet ro-und the coils q ot which the electric impulses from' a telephonie transmitter or other sourcefire caused to circulate. q are `the connecting-Wires for the coils. :The .magnetis-mounted upon a tixedhase K3. rlhis magnet maybe polarized,

if desirable, by 'a steel polarizer placed in its neighborhood or by causinga uniform current of electricity to circulate roundlthe coils q or roundan .independent coil or coils Q wound on the'same core. R 1s an electric conductor which maybe in the form of a sphere or'ofa circular disk, as shown, andis prefer ably of copper. Thcdi-sk Ris mounted-upon a lshatft r in such manner that the poles q2 of the magnet embrace the disk, as seen in Fig. 3. The disk Ris rotated in a constant direction and at a more or less uniform' speed by' any suitable means, asby pulleys fr on 'its shaft, light smooth bands r2, and ld ri'ving-p'ul! ]eys ri, operated by an. extraneous force. r4` is a bracket supporting the conductor-shaft fr and attached either rigidly or by stout blocks o fV indiarubber to the secondary diaphragm L or similar vibratory body, preferably at, or about its center. Only Va portion-of the dial phragm is'shown; but it is to be understood that its size' relative to the 'other parts ot the `apparatusl ismu'ch larger than is depicted in 'the drawings and that it is supported in any manner which will permitv of it vibrating f reel y-as, for example, at' its edges, as shown in Fig. 1. Two sets of d rivingpulleys and bands are employed, as shown-one on each side 4of thedisk R-in order-that the latter may run smoothly and not impart undue vi' bration's' to the diaphragm. The relatiye po sitions of the parts and thedirect'ion of rota- --tionare preferably such that the pull on the diaphragm acts along lines more o r less perpendicular thereto.4

-ThaOperation of the apparatus is as follbws: Thetension' of the bands r2 or t-he speed of-rotation or both is preferably so adjusted 6o that the bands exert normally a slight but uniform pull upon the 'diaphragm sutiicient to main-tain the latter in a taut and sensitive condition. The electric impulses circulating round the coils' q make by means of the magnet a magnetic field whose strength varies as the force andduration of said impulses. l The variations in the magnetic field offer'v corre-4 spondingly-varyingamountsofretardingforce to the rotation of. the conductor-disk R, 'and thus cause to be applied to the diaphragm similarly-varying amounts of the motive-power of said disk. .-In other Words, the force 'of the pull of the bands @upon the diaphragm is varied in exact accordance with the impulses passing round the magnet-coils, with the result that there. is set up in the diaphragm. a series of vibrations similar to the original vibrations or impulses.- It the original vibrations are sound or other mechanicalvibrations, the diaphragm L reproduces them in a magnified degree. If the electric impulses only are to be magniiied, the diaphragm Lis connected with V`anV ordinary electric'transmitte of proper-- "proportions, (not shown,) which reproduces the impulses in a magnified degree.-

In the apparatus sh-own in Figs. 4 and 5,

the electro-magnet Q is mounted upon the diaphragm L, and the disk R land its'shaft are mounted upon a stationary support in proximity to the diaphragm. The action of the apparatus is the same as that previously described, the varying retardation offered-to the movement ofthe disk reacting through the .magnet to vibrate.4 the'diaph ragm.

In Figs. 6 and 7 the conductor is shown as an endless traveling band R', supported at one end upon thepulley fr', whieh-is'm'olinted -.upon the bracket-r4, .attached to the dia- 8, 9, andlO'the magnet Q is attached to the diaphragm and the -bandconductor R `is mounted independently of thediaphragm and runs between the poles q2, of the magnet, which are hollowed out, as shown in Fig'. 10, to embrace the conductor, the latter having in this case a circular cross-section.

Figs. 11 and 12 show a v ery similar arrangement, in which the magnet Q, instead of being attached directly to'the diaphragm is attached by alaterally-iiexible stem' qs to the fixed support K3 in such manner that it can be vibrated, `as in the case of the magnet shown in Fig-n.18, in accordance' with theelectric `im pulses circulating round its coils. The

vibrations of the magnet are tra'nsmitted'inr' directly to the diaphragm by ,any suit-able mechanical device', such as a post N3, the endsv Aof which are pointed,"as shown, and rest the one end within anindentation in a button Z'v on the diaphragm and. the other end Awithin an indentation in a cross-piece qi on the magnet. A

The apparatus' shown in Figs. 1 3 and 14 is the same as that just described, with the exreplaced by a liquid conductor R2 in the form of a continuous jet, preferably of water, which IOO IIO

eeption that-the solid band-conductor 'R' is 477 see projected between the hollowedLout poles of the magnet, as in the caseof thetraveling band-R". T5 is tlie'waterupply pipe provided with a nozzle rsgand rl is a funnel to receive the water afterityhas paSSed-the magnctand convey it to thedischargepipe ra.

.In Fig. 15 a reverseda arrangementof 'the I prccedingapparatus isi` shown, in .which the magnet Q is fixed and the funnel frlis mov-l by inflexible section -by the post N8. The secon'dary diaphragm L when employed nifiedvibratious lofthe diaphragm maybe transferred to the'recording-surface of a plionogr'aph or similar instrumenhor they may brations require to be magnified. It mayals'o able, beingconnected to the discharge-pipe rs. r9 and to the diaphragm for reproducing the magnified sounds directly may bep'rdvided with a trumpet-mouth of any suitable shape. (Not shown.) The mag be employed to work Vthe valve or frici onal device of sound-magnifying'apparatus such as described in my applications serially numbered 404,654 and 404,656. v

The apparatusmay be employed in most cases where sound or minute mechanical vibe employed as a relay or .sensitive receiver for a telegraphic or telephonieapparatu's, or

ifi-can be used in conjunction with other elec. tric apparatus vin which a series of electric impulses is 'required to be magnified or ren' 'dered visible or audible.

I declarethat -whatl claim is-- f 1. In an apparatus for Amagnifying minute vibrations or impulses of the kind described,

the combination of anelectric conductor moving in aconstant direction, amagnetic field lvarying'asI the vibrations -or impulses to be- 'm'agnified and op'posingtoI the movement .of said. conductor correspondingly--varying -amounts of electrofmagnetic retardatioma body capable of vibrating, as described, and

means whereby there is applied to said vibratory body successive portions of the motive power ofthe conductor varying in accordancewith-the-power absorbed 1n overcoming said varying amounts of'retardation.l f v 2. In an apparatus for magnifying minute -vibrationsorfimplsesof the kind described,-

the combination-of the transforming device, whereby thefvibrations to be magnifiedare' transformed into 'a 'correspondingseries-of electricalimpulses, an electro-magnet capable of producing a magnetic field varying in yaccordance. with such. impulses,- anelectric conductor. passing through the magnetic field and drive`n ina constant direction by an extraneous force,avi'bratory body, as de cribed,

.conveniently mounted with respect o .said

magnet and conductor, and means whereby the said body is vibrated in accordancel with the-varying amounts'of power expended by .the moving conductor in overcoming thev va# magnetic field, substantially as described.

ing a magnetic fieldk varying 'in accordance with the electrical impulses passing round its core, .ofv a vibratory diaphragm and an electric conductor moving through tlie magnetic -field 'in aconstantdirection Aunder tho inf' f'luenee ofan extraneous force and adapted amounts of f retarding torce'. opposed to the movement of the .conductor by the saidvaryin gv magneti c field, substantially as' described.

4. In an apparatus ofthe kind described,

the combination, with an electroinagnet h av-`l vto impart Nto thediapliragm'a series of pulls `or pushes varying in amount as the varying 175 inga magnetic .field varying in accordance with the electrical impulses' passing round itsj core, of a device creating a .second but constant magnetic field, a vibratory diaphragm,

and an electr-ic conductor moving in ac on-jstant direction through both magnetic fields under the influence of an-extraneous force and normally-exertinga constant pull or push l von said diaphragm by reason of the retarding force opposed tothe conductor by thefsa'id' second magnetic field, whereby. the variations in the first magneticv field producecorrespond'- substantiallyas described. I

5. In an apparatus of the kind described', the combinationfofan electricconductormovingin a. lconstant direction and. exertinga ingvariations in the-amount of said pull or; push and cause the. diaphragm tobe vibrated,

constantbut slight push .or pull on a' diaphrag'm, tending toA distort .the same, and a magnetic `field varying fas -the'-.vibrations.o r impulses to beinagnified and opposing to said l too .conductor correspondingly-varying amounts of retarding force, subf-itantially-` as and; for

the-purposedescribed. n

6. In an apparatus of Athe kind described,` 'thecombinatiom with an'- elect'ro-niagnet havin g. its magnetic field 'varying' as the vibrations'orlimpulsesvto be magnified, ofi-'an elec-- tric conductor moving in a constant direction through said -fie1d,'a support for said conductor in proximity to the magneand a vibratory. diaphragm connected to and movable.

with said magnet or support, substantially as @"115 7.. In an apparatus of thekinddescribed, the combination, with an electro-magnethav-4 described.

ing a magnetic field varying as described, of

an electric conductor moving through'said field in a constant'direction, afvibratorydiaphragm, and a bracketmoun'ted upon 'saiddia phragm and serving asasupport for said conductor, substantially as described. 8.- In an apparatus 'of the kinddescribed,

the combination? of .an electro-magnet having a magnetic .field varying as described, `of an' electricconductor `moving through said field in a constant direction andv a vibratorydia.-

phragm movable with saidmagnet, substan# I rv13o 9.. In'anapparatus ,ofthe kind described,v the combination ofl 'the electro-magnet'Q, hav;

in g varying magnetic field,L as described,.,the

disk R', -of electrieconducting material, rotat ing between the magnet-poles, the bracket/IA., Q, metallic disk R, rotating between the poles supporting the Idisk, and the.vibratory dia thereof, diaphragmL, supporting thermagnet,

phragm L, supporting thebracket, substanand drivingv mechanism foi' rotating the disk i5'vv tally as described.' 'in a. vconstant direction, substantially as de'- 10. The-combination ofthe electro-magnet scribed. Q,'lnetallic disk R, rotating between the polesy I n testimony Awhereof I have signed my thereof, diaphragm L, bracket 1A, mounted on name to this specification in the presencero diaphragm Aand supporting-disk R, bandtwo subscribing Witnesses wheels ll" fr', one on each side ofthe disk and i 'RO-BT: HOPE-J ONES. 1o' revolving therewith, drivingbands r2, and lfitnessesz driving-Wheels frs, substantially as described. h WM. P. THOMPSQN,

'11. The combination of the electro-magnet H. P. SOOBRIDGE. 

